donut recipe

**Ingredients:** - 2 1/4 teaspoons active dry yeast (1 packet) - 1/2 cup warm water (about 110°F or 43°C) - 1/4 cup granulated sugar - 1/2 cup milk, warmed - 1/4 cup unsalted butter, melted - 1 teaspoon vanilla extract - 1 large egg - 3 1/2 cups all-purpose flour - 1/2 teaspoon salt - Vegetable oil, for frying